<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			.tranBox{
				margin: 350px;
				width: 10px;
				height: 10px;
				background-color: green;
				border-radius: 10px;
				transition: 20s;
			}
			.tranBox:hover{
				margin: 50px;
				width: 610px;
				height: 610px;
				border-radius: 600px;
			}
		</style>
	</head>
	<body>
		<h3>拉伸盒子动画效果</h3>
		<div class="tranBox">
			
		</div>
	</body>
</html>
